US4198554A - Method and apparatus for microwave vulcanization of extruded rubber profiles - Google Patents

Method and apparatus for microwave vulcanization of extruded rubber profiles Download PDF

Info

Publication number
US4198554A
US4198554A US05/812,365 US81236577A US4198554A US 4198554 A US4198554 A US 4198554A US 81236577 A US81236577 A US 81236577A US 4198554 A US4198554 A US 4198554A
Authority
US
United States
Prior art keywords
conveyor belt
rubber profiles
microwave
oven
microwave energy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/812,365
Inventor
I. R. Wayne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
COBER ELECTRONICS Inc
Original Assignee
COBER ELECTRONICS Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by COBER ELECTRONICS Inc filed Critical COBER ELECTRONICS Inc
Priority to US05/812,365 priority Critical patent/US4198554A/en
Application granted granted Critical
Publication of US4198554A publication Critical patent/US4198554A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material
    • H05B6/788—Arrangements for continuous movement of material wherein an elongated material is moved by applying a mechanical tension to it
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/10—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation for articles of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0855—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using microwave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/001—Profiled members, e.g. beams, sections
    • B29L2031/003—Profiled members, e.g. beams, sections having a profiled transverse cross-section

Definitions

  • the present invention relates to the rubber vulcanization and more specifically to a method and apparatus for microwave vulcanization of extruded rubber profiles to prevent under curing of such profiles when supported on a platform or conveyor belt.
  • the extruded rubber profiles may include automotive gaskets, automotive weather stripping etc.
  • the rubber may be polar as well as non-polar, although the present invention is particularly useful for non-polar rubbers which are poor receptors of microwave energy.
  • the apparatus and associated method of the present invention includes a microwave emitter positioned below and in close proximity to a support means having a high dielectric constant for supporting rubber profiles in a microwave oven to achieve more complete curing of the portions of the rubber profiles which are in direct contact with the support means.
  • FIG. 1 is a perspective view, with parts broken away, of a continuous feed vulcanizing oven utilizing the present invention
  • FIG. 2 is a top plan view of the continuous feed vulcanizing oven of FIG. 1;
  • FIG. 3 is a sectional view taken along lines 3--3 of FIG. 2.
  • a continuous feed vulcanizing oven embodying the present invention is shown generally at 10.
  • the oven includes an entrance end 12 and an exit end 14.
  • a conveyor belt 16, formed of silicone rubber covered fiber glass is driven through the oven 10 between the entrance end 12 and exit end 14.
  • the conveyor belt 16 is made of woven fiber glass impregnated on both sides with silicone rubber.
  • this construction of the conveyor belt 16 provides a high dielectric constant which provides a low reluctance path for the microwave energy and directs the plane and location of the electromagnetic energy from a microwave emitter 20, i.e., concentrates the energy field.
  • the high dielectric constant is in the range of about 5 to about 8.
  • the conveyor belt 16 has a thickness of 0.025 inches with 0.005 inches being silicone rubber.
  • the extruded rubber profiles 18 to be cured are conveyed through the oven 10 by the conveyor belt 16.
  • the conveyor belt 16 may be driven by a conventional motor drive unit, as is well known in the art, to convey the rubber profiles 18 serially past the microwave emitter 20.
  • triple chokes are arranged at the entrance end 12 and exit end 14 to inhibit microwave leakage from the oven 10.
  • any door included in the oven 10, see FIG. 3, preferably includes a quarter wave choke to further prevent microwave leakage from the oven 10.
  • the microwave emitter 20 Arranged below the conveyor belt 16 and in close proximity thereto is the microwave emitter 20.
  • the microwave emitter 20 is arranged from about 4 to about 8 inches below the conveyor belt 16 and directs energy toward the bottom of the conveyor belt 16.
  • the emitting end 23 of the microwave emitter 20 is arranged parallel to the conveyor belt 16 in a plane normal to the conveyor belt 16, between at an angle of about 0° to the conveyor belt 16, to an angle of about 45° to the conveyor belt 16.
  • the emitted microwave energy is normally in the range of about 3 to about 24 kilowatts.
  • the microwave energy passes from the emitter 20 through the conveyor belt 16 and into the rubber profile 18 as the rubber profile 18 passes over the emitter 20.
  • the low reluctance path provided by the high dielectric conveyor belt 16 facilitates penetration of the microwave energy through the conveyor belt 16.
  • the emitter 20 is arranged within a screen 22 from which hot air, generated in a conventional manner, is emitted toward the conveyor belt 16 to aid in the vulcanization process.
  • the microwave energy from the emitter 20 is directed into the conveyor belt 16 which concentrates the energy field therein and facilitates transmission of the microwave energy to the rubber profiles 18 at the points where they contact the conveyor belt 16. This results in rapid oscillation of the molecules in the rubber profile, causing heating and curing thereof.
  • microwave emitters are alternately arranged above and below the conveyor belt 16, see FIGS. 1 and 2.
  • emitter 24, 20 and 26 are shown.
  • Microwave energy is supplied to these emitters by a microwave generator such as Cober Model S6F, available from Cober Electronics, Inc., Stamford, Conn.
  • microwave energy In a continuous feed vulcanizing oven having four microwave, emitters alternately arranged above and below a conveyor belt, which is driven at 75 feet per minute, microwave energy of 6 kilowatts is emitted from each emitter to increase the temperature of extruded rubber profiles, approximately 11/2 inches wide and 3/4 inches high, by 200° F. That is, the temperature of the extruded rubber profiles which may be approximately 200° F. after coming from the extruder, is raised to approximately 400° F. before exiting from the oven. Concurrently, with the microwave emissions, hot air at approximately 450° F. is directed upward toward the conveyor belt from the hot air source.
  • the use of conventional forced hot air heat is advantageous. It has proved to be most beneficial if directed upward from directly below the conveyor belt 16.
  • the hot air source surrounds the microwave emitter 20.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

A method and apparatus for vulcanizing extruded rubber profiles in vulcanizing ovens to eliminate under cure of the rubber profiles in those areas where the extruded rubber profiles contact a support means by arranging at least one microwave emitter below and in close proximity to the support means. The support means having a high dielectric constant to provide a low reluctance path therethrough so that the microwave energy passes through the support means into the rubber profiles to improve curing of the rubber profiles in the areas where they contact the support means.

Description

The present invention relates to the rubber vulcanization and more specifically to a method and apparatus for microwave vulcanization of extruded rubber profiles to prevent under curing of such profiles when supported on a platform or conveyor belt. The extruded rubber profiles may include automotive gaskets, automotive weather stripping etc. The rubber may be polar as well as non-polar, although the present invention is particularly useful for non-polar rubbers which are poor receptors of microwave energy.
In known continuous feed vulcanizing ovens, the rubber profiles or products to be cured are placed on a conveyor belt and fed through an oven at a rate to achieve proper cure. The ovens use heat and/or microwave energy to effect the curing. With known arrangements, it is difficult to obtain proper curing at the points where the rubber products contact the conveyor belt. One attempt to solve this under cure problem has resulted in the addition of conveyor pre-heater system, which preheats the conveyor belt. The technique has resulted in some improvement, but has not been entirely satisfactory.
It is an object of the present invention to provide a method and an apparatus for eliminating under cure of rubber profiles in the areas where the rubber profiles contact a non-metallic platform or conveyor means in a vulcanizing oven.
It is a further object of the present invention to provide a method and apparatus for achieving a more complete curing of rubber profiles in a continuous feed vulcanizing oven.
Other objects, aspects and advantages of the present invention will be apparent from the detailed description and the drawings.
Briefly, the apparatus and associated method of the present invention includes a microwave emitter positioned below and in close proximity to a support means having a high dielectric constant for supporting rubber profiles in a microwave oven to achieve more complete curing of the portions of the rubber profiles which are in direct contact with the support means.
The present invention is illustrated in the accompanying drawings in which:
FIG. 1 is a perspective view, with parts broken away, of a continuous feed vulcanizing oven utilizing the present invention;
FIG. 2 is a top plan view of the continuous feed vulcanizing oven of FIG. 1; and
FIG. 3 is a sectional view taken along lines 3--3 of FIG. 2.
Referring to FIG. 1, a continuous feed vulcanizing oven embodying the present invention is shown generally at 10. The oven includes an entrance end 12 and an exit end 14. A conveyor belt 16, formed of silicone rubber covered fiber glass is driven through the oven 10 between the entrance end 12 and exit end 14. Preferably, the conveyor belt 16 is made of woven fiber glass impregnated on both sides with silicone rubber. Advantageously, this construction of the conveyor belt 16 provides a high dielectric constant which provides a low reluctance path for the microwave energy and directs the plane and location of the electromagnetic energy from a microwave emitter 20, i.e., concentrates the energy field. The high dielectric constant is in the range of about 5 to about 8. Typically, the conveyor belt 16 has a thickness of 0.025 inches with 0.005 inches being silicone rubber.
The extruded rubber profiles 18 to be cured are conveyed through the oven 10 by the conveyor belt 16. The conveyor belt 16 may be driven by a conventional motor drive unit, as is well known in the art, to convey the rubber profiles 18 serially past the microwave emitter 20. Preferably triple chokes (not shown) are arranged at the entrance end 12 and exit end 14 to inhibit microwave leakage from the oven 10. Further, any door included in the oven 10, see FIG. 3, preferably includes a quarter wave choke to further prevent microwave leakage from the oven 10.
Arranged below the conveyor belt 16 and in close proximity thereto is the microwave emitter 20. Preferably the microwave emitter 20 is arranged from about 4 to about 8 inches below the conveyor belt 16 and directs energy toward the bottom of the conveyor belt 16. Preferably, the emitting end 23 of the microwave emitter 20 is arranged parallel to the conveyor belt 16 in a plane normal to the conveyor belt 16, between at an angle of about 0° to the conveyor belt 16, to an angle of about 45° to the conveyor belt 16. Depending on the thickness and configuration of the rubber profiles, the emitted microwave energy is normally in the range of about 3 to about 24 kilowatts. The microwave energy passes from the emitter 20 through the conveyor belt 16 and into the rubber profile 18 as the rubber profile 18 passes over the emitter 20. The low reluctance path provided by the high dielectric conveyor belt 16 facilitates penetration of the microwave energy through the conveyor belt 16. Preferably, the emitter 20 is arranged within a screen 22 from which hot air, generated in a conventional manner, is emitted toward the conveyor belt 16 to aid in the vulcanization process.
The microwave energy from the emitter 20 is directed into the conveyor belt 16 which concentrates the energy field therein and facilitates transmission of the microwave energy to the rubber profiles 18 at the points where they contact the conveyor belt 16. This results in rapid oscillation of the molecules in the rubber profile, causing heating and curing thereof.
Preferably, in a continuous feed vulcanizing oven for complete curing, microwave emitters are alternately arranged above and below the conveyor belt 16, see FIGS. 1 and 2. In FIGS. 1 and 2, emitter 24, 20 and 26 are shown. Microwave energy is supplied to these emitters by a microwave generator such as Cober Model S6F, available from Cober Electronics, Inc., Stamford, Conn.
In a continuous feed vulcanizing oven having four microwave, emitters alternately arranged above and below a conveyor belt, which is driven at 75 feet per minute, microwave energy of 6 kilowatts is emitted from each emitter to increase the temperature of extruded rubber profiles, approximately 11/2 inches wide and 3/4 inches high, by 200° F. That is, the temperature of the extruded rubber profiles which may be approximately 200° F. after coming from the extruder, is raised to approximately 400° F. before exiting from the oven. Concurrently, with the microwave emissions, hot air at approximately 450° F. is directed upward toward the conveyor belt from the hot air source.
In conjunction with the curing energy from the microwave emitters, the use of conventional forced hot air heat is advantageous. It has proved to be most beneficial if directed upward from directly below the conveyor belt 16. Advantageously, the hot air source surrounds the microwave emitter 20.
It should be understood by those skilled in the art that various modifications may be made in the present invention without departing from spirit and scope thereof as described in the specification and defined in the appended claims.

Claims (2)

What is claimed is:
1. A vulcanizing oven of the type having entrance and exit ends with a conveyor belt driven between the entrance and exit ends for conveying extruded rubber profiles to be vulcanized through the oven, the improvement comprising:
at least one microwave emitter positioned below the conveyor belt and in close proximity thereto for transmitting microwave energy toward the conveyor belt and preferentially concentrating the microwave energy at the interface of the rubber profiles with the conveyor belt,
the conveyor belt having a dielectric constant of betwen about 5 to about 8 to provide a low reluctance path through the conveyor belt for the microwave energy to facilitate transmission of the microwave energy through the conveyor belt and into the rubber profiles to provide improved curing of the rubber profiles at the interface of the rubber profiles with the conveyor belt.
2. A vulcanizing oven as claimed in claim 1, including:
hot air directing means in the oven for directing hot air toward the conveyor belt.
US05/812,365 1977-07-01 1977-07-01 Method and apparatus for microwave vulcanization of extruded rubber profiles Expired - Lifetime US4198554A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/812,365 US4198554A (en) 1977-07-01 1977-07-01 Method and apparatus for microwave vulcanization of extruded rubber profiles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/812,365 US4198554A (en) 1977-07-01 1977-07-01 Method and apparatus for microwave vulcanization of extruded rubber profiles

Publications (1)

Publication Number Publication Date
US4198554A true US4198554A (en) 1980-04-15

Family

ID=25209357

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/812,365 Expired - Lifetime US4198554A (en) 1977-07-01 1977-07-01 Method and apparatus for microwave vulcanization of extruded rubber profiles

Country Status (1)

Country Link
US (1) US4198554A (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4275283A (en) * 1978-10-26 1981-06-23 Paul Troester Maschinenfabrik Apparatus for heating rubber products with UHF energy
US4324965A (en) * 1979-07-25 1982-04-13 Hermann Berstorff Maschinenbau Gmbh Microwave heating method and apparatus including adjustable tuning members
DE3202547A1 (en) * 1981-01-29 1982-11-04 Minnesota Mining and Manufacturing Co., 55133 Saint Paul, Minn. Heat-shrinkable article
US4405850A (en) * 1978-10-06 1983-09-20 Raytheon Company Combination microwave heating apparatus
FR2525063A1 (en) * 1982-04-10 1983-10-14 Toyoda Gosei Kk
US4456806A (en) * 1981-08-06 1984-06-26 Sumitomo Rubber Industries, Ltd. Method and apparatus for the high frequency preheating of elastomeric products
WO1984002570A1 (en) * 1982-12-22 1984-07-05 Buehler Ag Geb Device and method for processing alimentary pastes by microwaves
US4512942A (en) * 1983-06-13 1985-04-23 B. F. Goodrich Company Method and apparatus for vulcanizing hose
WO1986002229A1 (en) * 1984-09-26 1986-04-10 Sprinter System Ab Power pack using microwave energy for heating
US4624854A (en) * 1984-09-03 1986-11-25 Hermann Berstorff Maschinenbau Gmbh Continuous method of sterilizing foodstuffs
US4684777A (en) * 1980-04-02 1987-08-04 Raytheon Company Product support tray for microwave processing
FR2626134A1 (en) * 1988-01-15 1989-07-21 Mcneil Akron Repiquet Sarl Microwave applicator for the treatment of products, especially for the vulcanisation of rubber products or the like
US4896005A (en) * 1988-03-31 1990-01-23 Hermann Berstorff Maschinenbau Gmbh Method and apparatus for the continuous heating, pasteurization or sterilization of foodstuffs or the like by microwave energy
FR2675621A1 (en) * 1991-04-19 1992-10-23 Swisscab E Kertscher Sa PROCESS AND INSTALLATION FOR THE MANUFACTURE OF A FLAT CABLE, PARTICULARLY WITH OPTICAL FIBERS.
WO1992018892A1 (en) * 1991-04-19 1992-10-29 E. Kertscher S.A. Method and equipment for continuously producing a flat cable, particularly an optical fibre cable
US5458824A (en) * 1992-04-23 1995-10-17 The Geauga Company Method of manufacturing a rubber/plastic co-extrudate
US5762972A (en) * 1995-03-22 1998-06-09 Daewoo Electronics Co., Ltd. Apparatus for heating a mold for an injection molding system
WO1999044392A1 (en) * 1998-02-27 1999-09-02 Standard Products Industriel Microwave heating of a material
US6225611B1 (en) 1999-11-15 2001-05-01 Hull Corporation Microwave lyophilizer having corona discharge control
CN102179889A (en) * 2011-01-31 2011-09-14 江阴海达橡塑股份有限公司 Method for extrusion and vulcanization molding of rubber product by using support frame
US20140162861A1 (en) * 2012-12-11 2014-06-12 Sumitomo Rubber Industries, Ltd. Rubber foam tube production method, electrically conductive roller, and image forming apparatus
US20150045196A1 (en) * 2013-08-07 2015-02-12 Sumitomo Rubber Industries, Ltd. Method of producing electrically conductive foam rubber roller, electrically conductive foam rubber roller, and image forming apparatus
US9204501B1 (en) * 2010-03-17 2015-12-01 Cibus Wave LLC Microwave system and method
US20170188418A1 (en) * 2012-03-14 2017-06-29 Microwave Materials Technologies, Inc. Enhanced microwave system utilizing tilted launchers

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3242304A (en) * 1963-07-22 1966-03-22 Philips Corp High frequency heating apparatus
FR1598340A (en) * 1967-12-09 1970-07-06
US3535483A (en) * 1967-02-10 1970-10-20 Krupp Gmbh Microwave heating apparatus
US3715551A (en) * 1971-07-01 1973-02-06 Raytheon Co Twisted waveguide applicator
US3854024A (en) * 1974-02-01 1974-12-10 Dca Food Ind Environmental temperature control system
US3889009A (en) * 1972-07-31 1975-06-10 Samuel P Lipoma Method for continuous electromagnetic sterilization of food in a pressure zone
US3953703A (en) * 1974-10-03 1976-04-27 Materials Research Corporation Method for drying ceramic tape
US4045639A (en) * 1973-01-16 1977-08-30 Food Processing Systems Corporation Continuous microwave and vacuum dryer

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3242304A (en) * 1963-07-22 1966-03-22 Philips Corp High frequency heating apparatus
US3535483A (en) * 1967-02-10 1970-10-20 Krupp Gmbh Microwave heating apparatus
FR1598340A (en) * 1967-12-09 1970-07-06
US3715551A (en) * 1971-07-01 1973-02-06 Raytheon Co Twisted waveguide applicator
US3889009A (en) * 1972-07-31 1975-06-10 Samuel P Lipoma Method for continuous electromagnetic sterilization of food in a pressure zone
US4045639A (en) * 1973-01-16 1977-08-30 Food Processing Systems Corporation Continuous microwave and vacuum dryer
US3854024A (en) * 1974-02-01 1974-12-10 Dca Food Ind Environmental temperature control system
US3953703A (en) * 1974-10-03 1976-04-27 Materials Research Corporation Method for drying ceramic tape

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4405850A (en) * 1978-10-06 1983-09-20 Raytheon Company Combination microwave heating apparatus
US4275283A (en) * 1978-10-26 1981-06-23 Paul Troester Maschinenfabrik Apparatus for heating rubber products with UHF energy
US4324965A (en) * 1979-07-25 1982-04-13 Hermann Berstorff Maschinenbau Gmbh Microwave heating method and apparatus including adjustable tuning members
US4684777A (en) * 1980-04-02 1987-08-04 Raytheon Company Product support tray for microwave processing
DE3202547A1 (en) * 1981-01-29 1982-11-04 Minnesota Mining and Manufacturing Co., 55133 Saint Paul, Minn. Heat-shrinkable article
US4456806A (en) * 1981-08-06 1984-06-26 Sumitomo Rubber Industries, Ltd. Method and apparatus for the high frequency preheating of elastomeric products
FR2525063A1 (en) * 1982-04-10 1983-10-14 Toyoda Gosei Kk
WO1984002570A1 (en) * 1982-12-22 1984-07-05 Buehler Ag Geb Device and method for processing alimentary pastes by microwaves
EP0113900A1 (en) * 1982-12-22 1984-07-25 Bühler AG Apparatus and method for the treatment of food with microwaves
US4512942A (en) * 1983-06-13 1985-04-23 B. F. Goodrich Company Method and apparatus for vulcanizing hose
US4624854A (en) * 1984-09-03 1986-11-25 Hermann Berstorff Maschinenbau Gmbh Continuous method of sterilizing foodstuffs
WO1986002229A1 (en) * 1984-09-26 1986-04-10 Sprinter System Ab Power pack using microwave energy for heating
FR2626134A1 (en) * 1988-01-15 1989-07-21 Mcneil Akron Repiquet Sarl Microwave applicator for the treatment of products, especially for the vulcanisation of rubber products or the like
US4896005A (en) * 1988-03-31 1990-01-23 Hermann Berstorff Maschinenbau Gmbh Method and apparatus for the continuous heating, pasteurization or sterilization of foodstuffs or the like by microwave energy
FR2675621A1 (en) * 1991-04-19 1992-10-23 Swisscab E Kertscher Sa PROCESS AND INSTALLATION FOR THE MANUFACTURE OF A FLAT CABLE, PARTICULARLY WITH OPTICAL FIBERS.
WO1992018892A1 (en) * 1991-04-19 1992-10-29 E. Kertscher S.A. Method and equipment for continuously producing a flat cable, particularly an optical fibre cable
US5458824A (en) * 1992-04-23 1995-10-17 The Geauga Company Method of manufacturing a rubber/plastic co-extrudate
US5762972A (en) * 1995-03-22 1998-06-09 Daewoo Electronics Co., Ltd. Apparatus for heating a mold for an injection molding system
WO1999044392A1 (en) * 1998-02-27 1999-09-02 Standard Products Industriel Microwave heating of a material
FR2775551A1 (en) * 1998-02-27 1999-09-03 Standard Products Ind HEATING OF A MATERIAL BY MICROWAVE
US6225611B1 (en) 1999-11-15 2001-05-01 Hull Corporation Microwave lyophilizer having corona discharge control
US9204501B1 (en) * 2010-03-17 2015-12-01 Cibus Wave LLC Microwave system and method
US11723120B2 (en) 2010-03-17 2023-08-08 Cibus Wave LLC System and method for protecting microwave magnetrons
US10536996B1 (en) 2010-03-17 2020-01-14 Daniel Cashman Microwave system
CN102179889A (en) * 2011-01-31 2011-09-14 江阴海达橡塑股份有限公司 Method for extrusion and vulcanization molding of rubber product by using support frame
CN102179889B (en) * 2011-01-31 2013-05-01 江阴海达橡塑股份有限公司 Method for extrusion and vulcanization molding of rubber product by using support frame
US20170188418A1 (en) * 2012-03-14 2017-06-29 Microwave Materials Technologies, Inc. Enhanced microwave system utilizing tilted launchers
US9588454B2 (en) * 2012-12-11 2017-03-07 Sumitomo Rubber Industries, Ltd. Method of producing an electrically conductive roller from a rubber foam tube
US20140162861A1 (en) * 2012-12-11 2014-06-12 Sumitomo Rubber Industries, Ltd. Rubber foam tube production method, electrically conductive roller, and image forming apparatus
US20150045196A1 (en) * 2013-08-07 2015-02-12 Sumitomo Rubber Industries, Ltd. Method of producing electrically conductive foam rubber roller, electrically conductive foam rubber roller, and image forming apparatus

Similar Documents

Publication Publication Date Title
US4198554A (en) Method and apparatus for microwave vulcanization of extruded rubber profiles
US2603741A (en) High-frequency heating
US2472293A (en) Ventilated and shielded infrared oven
US2436732A (en) High-frequency electric field heating
JP4177963B2 (en) High frequency defroster
NO902212D0 (en) PROCEDURE AND APPARATUS FOR PASTEURIZATION AND COOKING OF UNCOKED PIZZA BASES.
EP0761612B1 (en) Method for heating a glass sheet
JPH0620749B2 (en) Continuous rubber vulcanizer
ATE203142T1 (en) OVEN WITH HOT AIR DUCT
US2980544A (en) Method of heating meat
US3830624A (en) Ovens
GB958392A (en) Improvements in or relating to high-frequency ovens
US3666905A (en) Method and apparatus for dielectric heating
KR20000003800U (en) Halogen lamp cooling structure of microwave oven
US3582598A (en) Methods and apparatus for heating a body conveyor system for heating bodies by a microwave cavity
US3916136A (en) Microwave cavity product transport system
US6072158A (en) Method and apparatus for heating thin plastic sheet with air diffuser plate preventing sagging of the sheet
GB2018098A (en) Microwave oven
SE7607040L (en) INSTALLATION FOR CONTINUOUS VULCANIZATION OF LONG-TERM VULCANIZABLE PRODUCTS
JP3493757B2 (en) Microwave heating apparatus and method
CA1038936A (en) Protective transporter for transporting materials to and from a microwave unit
US2650289A (en) Dielectric heating
US1999751A (en) Means for continuous vulcanization of rubber goods
KR200318200Y1 (en) device of drying using lamp
CN218365991U (en) One-step vulcanization oven for silica gel forming